If the strongly-coupled regime of the underlying dynamics is
very different from that of a QCD-like theory—in particular if the theory
has enough fermions to be close to the conformal window—the emergence of large
anomalous dimensions may enhance
the effective couplings at low energy, hence explaining why the top quark mass is large.
This is one motivation for composite Higgs models with partial top compositeness,
and this model provides the simplest template.
Similar ideas were put forward long time ago,
in the context of walking technicolor (see for instance
Refs. [1]}, [2]}), top compositeness [3]}, and
warped extra-dimensions [4]}, [5]}.
It would go beyond our scope to review the rich literature on
the subject, and we refer the interested reader to the discussion
in Ref. [6]},
in the context of dilaton-Higgs models, and
to follow the references therein.
